The original turbocharged diesel engine of this type design was very reliable and used in some german bombers in the second world war.

One downside of their design at that time was the engines very slow response to speed change demands. I was fortunate enough to visually examine one at an aircraft collection in Ottawa, Canada.

Before that I was aware they had existed. Never occured to me I might ever get to see and examine one. That engine must have been designed in the thirties.